Water cooler-mounted holder



FIG. 1 is a front, perspective view of a water cooler-mounted holder showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view of the water cooler-mounted holder of FIG. 1 with the back side view being a mirror image thereof; and,

FIG. 4 is a bottom view of the water cooler-mounted holder of FIG. 1. 

The ornamental design for a water cooler-mounted holder, as shown and described. 